Hotmail Problems

I'm having problems with my server where some hotmail emails aren't being received on the server. This is causing some issues for a client and hotmail aren't being helpful at all.

I've checked email logs as well as tailed the log files when sending emails from this particular hotmail account, but nothing seems to show up when sending emails from this address. I can send emails to this hotmail account but not receive any emails from it to any account on the server.

I've checked the servers IP against blacklists and also checked the MX records are all set up correctly, which they are and the servers IP is not blacklisted. The error code coming back in hotmail is (note: this "status" only ever appears when sending emails from this email address and another one similar to it. Both email addresses have the word "income" in them):
Action: failed
Status: 4.4.7

The above status appears with and without SpamAssassin being enabled. I've also disabled the firewall when sending emails just in case that was the issue.

As you can see, I've tried all sorts to get this sorted but contacting hotmail only ever gets "see this article" responses, which isn't helpful. If anyone can think of a way to resolve this or even additional things to try, please let me know.

Thanks for taking the time to read this thread and hopefully this can be resolved soon.

Replace youruser@hotmail.com with the actual hotmail email account you are using. Replace test@yourdomain.com with the email account on the cPanel server that you want to have receive the email. Please create a new test account for this email before performing the test. I am selecting a new test account so exim logs won't have other attempts in the log for the email account to make it easier to find the right log entry.

Please note that these commands would need to be run in root SSH and all the noted commands are required to complete it (so the final . on the last line must terminate the session for exim).

After doing the above commands, then please run the following command: